Machine Design

Diaphragm-Metering Pump

The 500AR Series hydraulic diaphragm-metering pump has an automatic air-release valve for use in sodium-hypochlorite service or with other chemicals that off-gas at room temperature.

Its PVC-head design minimizes internal space to eliminate areas where gas can accumulate. Ports slope upward to vent gas through the top of the pump and away from the diaphragm. A Teflon diaphragm isolates process chemicals from the pump's working parts, as well as the environment. A micrometer dial allows manual adjustment over a 10-to-1 turndown range. A Variable Oil By-pass stroke adjustment for improved valve performance is also standard.

Neptune Chemical Pump Co. Inc., Box 247, Lansdale, PA 19446, (215) 699-8700,

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